Power conversion device

Abstract

To provide a power conversion device that can reduce the workload during assembly while suppressing an increase in the number of parts.SOLUTION: A power conversion device 100 includes a DC-DC converter unit 21 that transforms DC power input from a DC power source 200, an inverter unit 10 that converts the DC power to AC power and supplies it to a load, a boost converter unit 20 that boosts the DC power and supplies it to the inverter unit 10, a current sensor 30 that measures the current flowing in the boost converter unit 20, and a flat base unit 22 on which the boost converter unit 20, the inverter unit 10, the DC-DC converter unit 21, and the current sensor 30 are arranged. The current sensor 30 includes a sensor unit 31 that measures a current flowing in the boost converter unit 20, and a housing 32 having a single fastening through hole 33a through which a fastening member 70 is inserted when fastened to the base unit 22, and a positioning through hole for positioning relative to the base unit 22.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a power conversion device, and more particularly to a power conversion device including a boost converter unit, an inverter unit, and a DC / DC converter unit. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a power conversion device including a boost converter unit, an inverter unit, and a DC / DC converter unit is known (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a power conversion device including a boost converter unit, an inverter unit, and a DC-DC converter unit. In the configuration disclosed in the above-mentioned Patent Document 1, the DC-DC converter unit and the inverter unit are arranged in positions facing each other. The above-mentioned Patent Document 1 also discloses a configuration in which the boost converter unit boosts DC power input from a DC power source and supplies it to the inverter unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-53944 A Summary of the Invention [Problem to be solved by the invention]

[0005] Here, a power conversion device is generally provided with a current sensor that measures the current flowing through the boost converter, although this is not disclosed in the above Patent Document 1. When providing a current sensor in a power conversion device such as that disclosed in the above Patent Document 1, it is desirable to suppress an increase in the number of parts and reduce the workload during assembly.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a power conversion device that can reduce the workload during assembly while suppressing an increase in the number of parts. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a power conversion device according to one aspect of the present invention includes a boost converter unit that boosts DC power input from a DC power source, an inverter unit that converts the DC power boosted by the boost converter unit into AC power and supplies it to a load, a DC / DC converter unit that transforms the DC power input from the DC power source, a current sensor that measures a current flowing through the boost converter unit, and a flat base unit on which the boost converter unit, the inverter unit, the DC / DC converter unit, and the current sensor are arranged, and the current sensor includes a sensor unit that measures a current flowing through the boost converter unit, and a housing having a single fastening through hole through which a fastening member is inserted when fastened to the base unit, and a positioning through hole for positioning relative to the base unit.

[0008] In the power conversion device according to one aspect of the present invention, as described above, the current sensor includes a housing having a single fastening through hole through which a fastening member is inserted when fastened to the base portion, and a positioning through hole for positioning with respect to the base portion. This makes it possible to fix the housing to the base portion by fastening a single fastening member, unlike a configuration in which the housing is fastened by a plurality of fastening members, and therefore it is possible to suppress an increase in the number of parts. In addition, since the housing has a positioning through hole, when the housing is fixed to the base portion, the positioning of the housing can be easily performed by the positioning through hole. In addition, since the housing can be fixed to the base portion by fastening a single fastening member, it is possible to reduce the workload during assembly compared to a configuration in which the housing is fixed to the base portion by a plurality of fastening members. As a result, it is possible to reduce the workload during assembly while suppressing an increase in the number of parts.

[0009] In the power converter according to the above aspect, preferably, the housing includes a first protruding portion protruding from one of a pair of first side surfaces facing each other and a second protruding portion protruding from the other of the pair of first side surfaces, the fastening through hole is provided in the first protruding portion, and the positioning through hole includes a first positioning through hole provided in the second protruding portion. With this configuration, since the first protruding portion and the second protruding portion protrude from different sides of the pair of first side surfaces, the fastening through hole and the first positioning through hole can be provided on different sides of the pair of first side surfaces. Therefore, the fastening through hole and the first positioning through hole can be disposed at positions farther apart than in a configuration in which the fastening through hole and the first positioning through hole are provided on the same side of the pair of first side surfaces. In addition, since the fastening member inserted through the fastening through hole also contributes to positioning the housing, the housing can be positioned at two locations that are farther apart than in a configuration in which the fastening through hole and the first positioning through hole are provided on the same side of the pair of first side surfaces. Therefore, when the housing is fixed by the fastening member, the housing can be positioned with high accuracy. As a result, when the current sensor is fixed to the base, the positioning accuracy of the current sensor can be improved compared to a configuration in which the fastening through hole and the first positioning through hole are provided on the same side of the pair of first side surfaces.

[0010] In this case, preferably, the positioning through hole is provided in the first protruding portion and further includes a second positioning through hole for positioning with respect to the base portion. With this configuration, the current sensor can be positioned by the two positioning through holes, the first positioning through hole and the second positioning through hole, so that the current sensor can be positioned more easily and reliably than in a configuration with only one positioning through hole.

[0011] In the configuration in which the positioning through hole includes the second positioning through hole, preferably, the first positioning through hole has an elongated hole shape extending in the first direction in which the first protrusion and the second protrusion are aligned, and the second positioning through hole has a perfect circle shape. With this configuration, since the first positioning through hole has an elongated hole shape extending in the first direction, it is possible to absorb manufacturing errors in the housing and the base part in the first direction. Furthermore, since the first positioning through hole has an elongated hole shape extending in the first direction, it is possible to position the housing relative to the base part in a direction intersecting the first direction while absorbing manufacturing errors in the housing and the base part in the first direction. As a result, by positioning the housing based on the second positioning through hole having a perfect circle shape, it is possible to easily position the current sensor even if there is a manufacturing error in the housing and the base part in the first direction.

[0012] In the configuration including the first positioning through hole in which the fastening through hole is provided in the first protrusion and the positioning through hole is provided in the second protrusion, preferably, the housing includes a first end face on the base side and a second end face opposite to the first end face, and the first and second protrusions are provided on the first end face side of the pair of first side faces so as to form a step between the first end face and the second end face. Here, for example, when the current sensor is fixed to the base in a non-contact state, the housing is fixed to a boss formed on the base and provided with an engagement portion with which the fastening member engages. In addition, when positioning the housing, a boss provided with a protrusion inserted into the positioning through hole is formed on the base, and the housing is positioned. When the height of the boss provided with the engagement portion and the height of the boss provided with the protrusion inserted into the positioning through hole are increased, the material of the base increases. Therefore, with the above configuration, the fastening through-holes and the positioning through-holes can be provided at positions closer to the base portion compared to a configuration in which the fastening through-holes and the positioning through-holes are arranged on the same plane as the second end face. Therefore, the height of the boss on which the engagement portion of the fastening member fastened to the base portion is provided and the boss on which the protrusion for positioning the current sensor is inserted into the positioning through-hole can be reduced. As a result, the material of the base portion can be reduced compared to a configuration in which the fastening through-holes and the positioning through-holes are arranged on the same plane as the second end face.

[0013] In this case, preferably, the end face of the first protrusion on the base side and the end face of the second protrusion on the base side are provided closer to the second end face than the center position between the first end face and the second end face. Here, when the first protrusion and the second protrusion are disposed in a position close to the first end face, the first protrusion and the second protrusion are disposed in a position farther away from the worker when the current sensor is attached to the base. Therefore, compared with the case where the first protrusion and the second protrusion are disposed in a position close to the worker, when the positioning protrusion is inserted into the first positioning through hole formed in the second protrusion, it becomes difficult to visually confirm the position of the first positioning through hole. Also, when the fastening member is inserted into the fastening through hole formed in the first protrusion, it becomes difficult to visually confirm the position of the fastening through hole. In contrast, by configuring as described above, the positions of the first protrusion and the second protrusion can be brought closer to the second end face while forming a step between them and the second end face. Therefore, the fastening through hole and the first positioning through hole can be provided at a position close to the second end face. Therefore, when positioning the current sensor, it is easy to visually confirm the position of the first positioning through hole. Also, when fixing the current sensor to the base portion, it is easy to visually confirm the position of the fastening through hole. As a result, the positioning work and fastening work of the current sensor can be easily performed while reducing the material of the base portion.

[0014] In the configuration including the first positioning through hole in which the fastening through hole is provided in the first protrusion and the positioning through hole is provided in the second protrusion, preferably, in the first direction in which the first protrusion and the second protrusion are aligned, the fastening through hole is formed in the first protrusion at a position aligned with the central portion of the pair of first side surfaces in the second direction intersecting with the first direction, and the second protrusion is formed with the first positioning through hole in the first direction at a position aligned with the central portion of the pair of first side surfaces. With this configuration, when fixing the current sensor to the base, a fastening force can be applied to the center of the housing in the second direction. As a result, it is possible to apply a fastening force evenly to the ends of the housing on one side and the other side in the second direction, so that the current sensor can be stably fixed to the base compared to a configuration in which the fastening through hole is arranged on either one end side in the second direction.

[0015] In the power conversion device according to the above aspect, preferably, the current sensor further includes a pair of bus bars, one of which is connected to the boost converter unit, and the pair of bus bars are provided on a pair of second side surfaces different from the pair of first side surfaces. With this configuration, since the pair of bus bars are provided on a pair of second side surfaces different from the pair of first side surfaces, it is possible to prevent the pair of bus bars from interfering with work when positioning and fastening the current sensor, compared to a configuration in which the pair of bus bars are provided on the pair of first side surfaces. As a result, it is possible to improve the workability of positioning and fastening the current sensor. Effect of the Invention

[0016] According to the present invention, as described above, it is possible to provide a power conversion device that can reduce the workload during assembly while suppressing an increase in the number of parts. [Brief description of the drawings]

[0017] [Figure 1] 1 is a circuit diagram of a power conversion device according to an embodiment. [Diagram 2] 1 is a perspective view of a power converter according to one embodiment; [Diagram 3] 1 is a side view of a power converter according to one embodiment; [Figure 4] 1 is an exploded perspective view for illustrating a configuration of a current sensor according to an embodiment and a configuration for attaching the current sensor to a base portion; [Diagram 5] FIG. 2 is a side view of a current sensor according to one embodiment. [Figure 6] FIG. 2 illustrates a top view of a current sensor according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0019] The configuration of a power conversion device 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 6. The power conversion device 100 is mounted on a vehicle, for example.

[0020] First, the circuit configuration of a power conversion device 100 will be described with reference to Fig. 1. The power conversion device 100 includes an input terminal 1 and an output terminal 2. The power conversion device 100 also includes an inverter unit 10, a boost converter unit 20, a DC-DC converter unit 21, a current sensor 30, and a DC power supply 200. The power conversion device 100 also includes a capacitor C1 and a resistor R.

[0021] The inverter unit 10 converts the DC power boosted by the boost converter unit 20 into AC power and supplies the AC power to a load 210. The load 210 is, for example, a motor. A switch 201 is provided between the power conversion device 100 and the DC power supply 200.

[0022] The inverter unit 10 includes a switching element module 11. The switching element module 11 converts DC power into AC power. The switching element module 11 also includes semiconductor switching elements Q1, Q2, and Q3 that form an upper arm, and semiconductor switching elements Q4, Q5, and Q6 that form a lower arm.

[0023] The inverter unit 10 includes a first inverter unit 10a and a second inverter unit 10b. The switching element module 11 includes a first switching element module 11a included in the first inverter unit 10a and a second switching element module 11b included in the second inverter unit 10b. The load 210 includes a first load 210a and a second load 210b. The first inverter unit 10a converts DC power input from the DC power source 200 into AC power and supplies it to the first load 210a. The second inverter unit 10b converts DC power input from the DC power source 200 into AC power and supplies it to the second load 210b.

[0024] The boost converter unit 20 boosts the DC power input from the DC power supply 200. In this embodiment, the boost converter unit 20 supplies the boosted DC power to the inverter unit 10. That is, the boost converter unit 20 is disposed on the input side of the inverter unit 10. The boost converter unit 20 includes a boost switching element module 20a and a reactor 20b. The boost switching element module 20a includes boost switching elements Q11 and Q12. The boost switching elements Q11 and Q12 respectively configure an upper arm and a lower arm. The boost converter unit 20 also includes a capacitor C2.

[0025] The reactor 20b is provided between the positive side of the DC power supply 200 and the connection point between the boost switching element Q11 and the boost switching element Q12. The capacitor C1 is provided between the boost converter unit 20 and the inverter unit 10. In this embodiment, the resistor R is provided between the boost converter unit 20 and the inverter unit 10. The capacitor C1 and the resistor R are provided in parallel with each other. The capacitor C2 is provided in parallel with the boost switching element Q12.

[0026] The DC-DC converter unit 21 transforms the DC power input from the DC power supply 200. In this embodiment, the DC-DC converter unit 21 converts the voltage of the DC power into a different voltage. Specifically, the DC-DC converter unit 21 steps down the voltage of the DC power input from the DC power supply 200 via the input terminal 1. The DC-DC converter unit 21 also supplies the stepped-down voltage to the output terminal 2.

[0027] The current sensor 30 measures the current flowing through the boost converter unit 20. In this embodiment, the current sensor 30 is provided between the reactor 20b and the boost switching element module 20a. That is, the current sensor 30 is configured to measure the current flowing through the reactor 20b.

[0028] The capacitor C1 is provided between the boost converter unit 20 and the inverter unit 10. In this embodiment, the resistor R is provided between the boost converter unit 20 and the inverter unit 10. The capacitor C1 and the resistor R are provided in parallel with each other.

[0029] The DC power supply 200 has an input terminal 1 provided on the inverter unit 10 side. The input terminal 1 includes a positive terminal 1a and a negative terminal 1b.

[0030] The output terminal 2 outputs DC power stepped down by the DC-DC converter section 21. The output terminal 2 is also connected to a control device (not shown) or the like.

[0031] Next, the structure of the power conversion device 100 will be described.

[0032] In this embodiment, as shown in FIG. 2, the power conversion device 100 includes a flat base portion 22 on which the boost converter portion 20, the inverter portion 10 (see FIG. 1), the DC-DC converter portion 21, and the current sensor 30 are disposed. In this embodiment, the current sensor 30 is disposed on the base portion 22 via a first boss 60, a second boss 61, and a third boss 62. The first boss 60, the second boss 61, and the third boss 62 are integrally formed on the base portion 22. The first boss 60, the second boss 61, and the third boss 62 may be formed separately from the base portion 22 and fixed to the base portion 22. In the example shown in FIG. 2, the boost switching element module 20a (see FIG. 1) is omitted for convenience.

[0033] 2, in this embodiment, the DC-DC converter section 21 includes a DC-DC converter element 23 and a DC-DC converter board 24 on which the DC-DC converter element 23 is mounted. The DC-DC converter board 24 has a flat plate shape. The DC-DC converter board 24 is disposed on the base part 22. The DC-DC converter element 23 mounted on the DC-DC converter board 24 includes a converter switching element 23a, a transformer 23b, a resonant reactor 23c, and a smoothing reactor 23d.

[0034] In this specification, the front-back direction of the base portion 22 is defined as the Z direction. Of the Z directions, the direction from the back surface of the base portion 22 to the front surface is defined as the Z1 direction, and the direction from the front surface of the base portion 22 to the back surface is defined as the Z2 direction. Of the two directions mutually perpendicular to the Z direction, one direction is defined as the X direction, and the other direction is defined as the Y direction. Moreover, the direction on one side of the X direction is defined as the X1 direction, and the direction on the other side is defined as the X2 direction. Moreover, the direction on one side of the Y direction is defined as the Y1 direction, and the direction on the other side is defined as the Y2 direction.

[0035] The converter switching element 23a is provided on the back surface side (Z2 direction side) of the DC-DC converter board 24. The transformer 23b, the resonant reactor 23c, and the smoothing reactor 23d are provided to penetrate the DC-DC converter board 24.

[0036] As shown in FIG. 2, the power conversion device 100 includes a cooling unit 50. The cooling unit 50 is flat. The cooling unit 50 is disposed between the inverter unit 10 (see FIG. 1) and the DC-DC converter unit 21. The cooling unit 50 is formed of a metal having relatively high thermal conductivity, such as aluminum. The cooling unit 50 has a rectangular shape when viewed from a direction perpendicular to the front surface (front surface (surface on the Z1 direction side)) and back surface (back surface (surface on the Z2 direction side)) of the cooling unit 50. The cooling unit 50 includes a cooling flow passage 51 (see FIG. 3) through which a cooling liquid flows. In the example shown in FIG. 2, the power conversion device 100 is illustrated so that the longitudinal direction of the cooling unit 50 is along the X direction and the short side direction is along the Y direction.

[0037] In this embodiment, the switching element module 11 (see FIG. 3) of the inverter section 10 is attached to the cooling section 50 so as to follow the front or back surface of the flat cooling section 50. Also, the DC-DC converter board 24 on which the DC-DC converter element 23 is mounted is attached to the cooling section 50 so as to follow the front or back surface of the flat cooling section 50.

[0038] Specifically, in this embodiment, the switching element module 11 is attached to the cooling unit 50 so as to fit along the back surface of the flat cooling unit 50. That is, the inverter unit 10 is provided on the other side (Z2 direction side) of the cooling unit 50. Also, the DC-DC converter board 24 on which the DC-DC converter element 23 is mounted is attached to the cooling unit 50 so as to fit along the front surface of the flat cooling unit 50.

[0039] Moreover, in this embodiment, the boost converter unit 20 is attached to the cooling unit 50 so as to follow the front or back surface of the flat-plate-shaped cooling unit 50. Specifically, the boost converter unit 20 is attached to the front surface of the cooling unit 50. Moreover, the boost converter unit 20 is disposed adjacent to the DC-DC converter unit 21 along the longitudinal direction (X direction) of the flat-plate-shaped cooling unit 50.

[0040] 3, cooling flow passage 51 is formed so that cooling liquid alternately passes through the front surface and the back surface of cooling unit 50. Specifically, cooling flow passage 51 is arranged on the front side (front surface side) and includes cooling flow passages 511, 515, and 519 as front-side flow passages, and cooling flow passages 513 and 517 as back-side flow passages arranged on the back side (back surface side), and cooling flow passages 512, 514, 516, and 518 as connecting flow passages. Cooling flow passage 51 is formed so that cooling liquid flows in from one end side in the longitudinal direction (X direction) of cooling unit 50 and flows out from the other end side.

[0041] In the cooling flow passage 51, cooling flow passages 511, 512, 513, 514, 515, 516, 517, 518, and 519 are connected in this order from upstream to downstream. That is, as shown in Fig. 3, the cooling liquid flows into the cooling flow passage 51 from the cooling flow passage 511 of the front side flow passage, passes through the cooling flow passage 512 of the connection flow passage, the cooling flow passage 513 of the back side flow passage, the cooling flow passage 514 of the connection flow passage, the cooling flow passage 515 of the front side flow passage, the cooling flow passage 516 of the connection flow passage, the cooling flow passage 517 of the back side flow passage, the cooling flow passage 518 of the connection flow passage, and the cooling flow passage 519 of the front side flow passage, and flows out. The inlet through which the cooling liquid flows in and the outlet through which the cooling liquid flows out of the cooling flow passage 51 may be disposed at the center of the short side direction of the cooling section 50. By arranging the components in this manner, in the power conversion device 100 shown in Figure 2, whether the surface on which the DC-DC converter unit 21 is arranged is the upper surface or the lower surface when it is fitted into the customer's equipment, the positions of the inlet through which the cooling liquid flows in and the outlet through which the cooling liquid flows out do not change, so there is no need for the customer to change the piping arrangement of the cooling liquid.

[0042] The cooling liquid flowing out of the cooling flow passage 51 is cooled by dissipating heat by the heat dissipation unit 3. The cooling liquid cooled by the heat dissipation unit 3 is pumped by the pump 4 and flows back into the cooling flow passage 51. The heat dissipation unit 3 includes a heat exchanger and is cooled by external air. The heat dissipation unit 3 is, for example, a radiator. The pump 4 may be disposed between the outlet of the cooling flow passage 51 and the heat dissipation unit 3, and the cooling liquid before dissipating heat by the heat dissipation unit 3 may be pumped by the pump 4. The cooling liquid is, for example, water, antifreeze, or other liquid.

[0043] 3, the inverter unit 10 is disposed on the back side of the cooling unit 50. That is, the inverter unit 10 is provided on the other side (Z2 direction side) of the cooling unit 50. The inverter unit 10 is cooled by a cooling liquid flowing through a back side flow path (cooling flow path 513 and cooling flow path 517). In this embodiment, the first switching element module 11a and the second switching element module 11b are disposed on the back side of the cooling unit 50 and are cooled by a cooling liquid flowing through the back side flow path.

[0044] Moreover, the DC-DC converter unit 21 is disposed on the front side of the cooling unit 50, and is cooled by the cooling liquid flowing through the front side passages (cooling passages 511, 515, and 519). Specifically, the converter switching element 23a, the transformer 23b, the resonant reactor 23c, and the smoothing reactor 23d are disposed on the front side of the cooling unit 50, and are cooled by the cooling liquid flowing through the front side passages.

[0045] The boost converter unit 20 is disposed on the front side of the cooling unit 50, and is cooled by the cooling liquid flowing through the front side flow paths (cooling flow paths 511, 515, and 519). Specifically, the boost switching element module 20a (see FIG. 1) and the reactor 20b are disposed on the front side of the cooling unit 50, and are cooled by the cooling liquid flowing through the front side flow paths. That is, in this embodiment, the DC-DC converter unit 21 (see FIG. 1) is provided on one side (Z1 direction side) of the cooling unit 50.

[0046] The current sensor 30 is disposed on the front side of the cooling unit 50. The current sensor 30 is not cooled by the cooling unit 50 because it is provided on the base unit 22 via the first boss 60 (see FIG. 2), the second boss 61 (see FIG. 2), and the third boss 62 (see FIG. 2).

[0047] (Current sensor) Next, the configuration of the current sensor 30 according to the present embodiment will be described with reference to FIGS.

[0048] As shown in Fig. 4, the current sensor 30 includes a sensor unit 31 and a housing 32. For convenience, the base unit 22 (see Fig. 2) is not shown in the example shown in Fig. 4.

[0049] The sensor unit 31 is configured to measure the current flowing through the boost converter unit 20 (see FIG. 2). The sensor unit 31 is configured to measure the current flowing through the boost converter unit 20 by, for example, any of an isolated ADC type having a shunt resistor and an isolated amplifier, a cored current sensor type, and a coreless current sensor type.

[0050] 4, the housing 32 has a single fastening through hole 33a through which a fastening member 70 is inserted when fastened to the base portion 22, and positioning through holes (first positioning through hole 34a and second positioning through hole 34b described below) for positioning with respect to the base portion 22. The housing 32 is made of an insulating resin material. The fastening member 70 is, for example, a screw.

[0051] As shown in FIG. 4, the housing 32 includes a first protrusion 33 and a second protrusion .

[0052] The first protrusion 33 is provided on the housing 32 so as to protrude from one side surface 35a of a pair of opposing first side surfaces 35. As shown in Fig. 4, the first protrusion 33 protrudes in the X2 direction from the side surface 35a of the pair of first side surfaces 35 that is on the X2 direction side.

[0053] Further, the second protrusion 34 is provided on the housing 32 so as to protrude from the other side surface 35b of the pair of first side surfaces 35. As shown in Fig. 4, the second protrusion 34 protrudes in the X1 direction from the side surface 35b of the pair of first side surfaces 35 that is on the X1 direction side.

[0054] In this embodiment, the fastening through hole 33a is provided in the first protruding portion 33. The positioning through holes include a first positioning through hole 34a provided in the second protruding portion 34. As shown in FIG. 4, the positioning through holes include a second positioning through hole 34b provided in the first protruding portion 33 for positioning with respect to the base portion 22. The fastening through hole 33a opens larger than the first positioning through hole 34a and the second positioning through hole 34b. The first positioning through hole 34a opens larger than the second positioning through hole 34b.

[0055] 4, the current sensor 30 includes a pair of bus bars 40, one of which is connected to the boost converter unit 20. The pair of bus bars 40 are provided on a pair of second side surfaces 36 different from the pair of first side surfaces 35. The pair of bus bars 40 extend in the Z1 direction.

[0056] One bus bar 40a of the pair of bus bars 40 protrudes from a side surface 36a on the Y1 direction side of the pair of second side surfaces 36. In addition, bus bar 40a is connected to a bus bar provided in reactor 20b (see FIG. 1).

[0057] Moreover, the other bus bar 40b of the pair of bus bars 40 protrudes from the Y2 direction side surface 36b of the pair of second side surfaces 36. The bus bar 40b is connected to the boost switching element module 20a (see FIG. 1).

[0058] 4, the first boss 60 includes an engagement hole 60a with which the fastening member 70 engages, and a first columnar portion 60b. The engagement hole 60a is provided in an end face 60c of the first columnar portion 60b on the opposite side (Z1 direction side) from the base portion 22. The first columnar portion 60b has a cylindrical shape. The first columnar portion 60b protrudes from the base portion 22 in the Z1 direction by a length L1. A screw groove is formed in the engagement hole 60a.

[0059] The second boss 61 includes a first protrusion 61a inserted into the first positioning through hole 34a and a second columnar portion 61b. The first protrusion 61a has a cylindrical shape. The first protrusion 61a is provided on an end surface 61c of the second columnar portion 61b on the opposite side to the base portion 22. The length L2 of the first protrusion 61a in the Z direction is equal to or greater than the thickness of the first positioning through hole 34a in the Z direction (the thickness T2 of the second protrusion 34 in the Z direction (see FIG. 5)). The second columnar portion 61b has a cylindrical shape. The second columnar portion 61b protrudes from the base portion 22 in the Z1 direction by a length L3.

[0060] The third boss 62 includes a second protrusion 62a inserted into the second positioning through hole 34b and a third columnar portion 62b. The second protrusion 62a has a cylindrical shape. The second protrusion 62a is provided on an end surface 62c of the third columnar portion 62b on the opposite side to the base portion 22. The length L4 of the second protrusion 62a in the Z direction is equal to or greater than the thickness of the second positioning through hole 34b in the Z direction (the thickness T1 of the first protrusion 33 in the Z direction (see FIG. 5)). The third columnar portion 62b has a cylindrical shape. The third columnar portion 62b protrudes from the base portion 22 in the Z1 direction by a length L5.

[0061] In this embodiment, the length L1 of the first columnar section 60b, the length L3 of the second columnar section 61b, and the length L5 of the third columnar section 62b are equal to each other. Also, the length L1 of the first columnar section 60b, the length L3 of the second columnar section 61b, and the length L5 of the third columnar section 62b are greater than the thickness T3 of the housing 32 in the Z direction (see FIG. 5).

[0062] Therefore, the current sensor 30 is fixed to the base portion 22 with the housing 32 and the base portion 22 not in contact with each other.

[0063] 5, the housing 32 includes a first end face 32a on the base portion 22 (see FIG. 2) side and a second end face 32b opposite to the first end face 32a. The first protrusion 33 and the second protrusion 34 are provided on the first end face 32a side of the pair of first side surfaces 35 so as to form a step 37 between the first protrusion 33 and the second protrusion 34 and the second end face 32b. Specifically, the step 37 is formed so that the first protrusion 33 and the second protrusion 34 are disposed on the Z2 direction side of the second end face 32b.

[0064] 5, the first protrusion 33 and the second protrusion 34 are provided on each of the pair of first side surfaces 35 so that their positions in the Z direction are substantially equal. Specifically, the first protrusion 33 and the second protrusion 34 are provided on each of the pair of first side surfaces 35 so that the end face 33b on the Z2 direction side of the first protrusion 33 and the end face 34c on the Z2 direction side of the second protrusion 34 are substantially equal in position in the Z direction. The first protrusion 33 and the second protrusion 34 are provided on each of the pair of first side surfaces 35 so that the end face 33c on the Z1 direction side of the first protrusion 33 and the end face 34d on the Z1 direction side of the second protrusion 34 are substantially equal in position in the Z direction.

[0065] 5, in this embodiment, the housing 32 extends in the X2 direction and has a tapered shape in which the thickness in the Z direction decreases as the housing 32 extends in the X2 direction, and includes a connection portion 33d that connects to the first protrusion 33. This can improve the mechanical strength of the first protrusion 33. The connection portion 33d is integrally formed with the first protrusion 33.

[0066] 5, the first protrusion 33 is provided on the housing 32 such that the center 33e in the Z direction of the first protrusion 33 is located on the Z1 direction side of the center 35c between the first end face 32a and the second end face 32b. In the present embodiment, the end face 33b of the first protrusion 33 on the base part 22 side is provided on the second end face 32b side of the center 35c between the first end face 32a and the second end face 32b.

[0067] 5, the second protrusion 34 is provided on the housing 32 such that the center 34e of the second protrusion 34 in the Z direction is located on the Z1 direction side of the center 35c between the first end face 32a and the second end face 32b. In the present embodiment, the end face 34c of the second protrusion 34 on the base part 22 side is located on the second end face 32b side of the center 35c between the first end face 32a and the second end face 32b.

[0068] 5, in this embodiment, the thickness T1 in the Z direction of the first protrusion 33 is smaller than the thickness T3 in the Z direction of the housing 32. Specifically, the thickness T1 in the Z direction of the first protrusion 33 is less than half the thickness T3 in the Z direction of the housing 32.

[0069] 5, in the present embodiment, the Z-direction thickness T2 of the second protrusion 34 is smaller than the Z-direction thickness T3 of the housing 32. Specifically, the Z-direction thickness T2 of the second protrusion 34 is less than half the Z-direction thickness T3 of the housing 32.

[0070] 6, in this embodiment, the first positioning through hole 34a has an elongated hole shape extending in the X direction in which the first protrusion 33 and the second protrusion 34 are aligned. Also, as shown in FIG 6, the second positioning through hole 34b has a perfect circular shape.

[0071] 6, in the first protrusion 33, a fastening through hole 33a is formed at a position aligned with a central portion 35d of the pair of first side surfaces 35 in the Y direction intersecting the X direction in the X direction in which the first protrusion 33 and the second protrusion 34 are aligned. Also, in the second protrusion 34, a first positioning through hole 34a is formed at a position aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction.

[0072] In other words, the first protrusion 33 has the fastening through hole 33a at a position where the length L6 in the Y direction from the other side 36b of the second side 36 to the center 33f of the fastening through hole 33a is approximately half the length L7 of the housing 32 in the Y direction.

[0073] In addition, the second protrusion 34 has a first positioning through hole 34a at a position where the length L8 in the Y direction from one side surface 36a of the second side surface 36 to the center 34f of the first positioning through hole 34a is approximately half the length L7 of the housing 32 in the Y direction.

[0074] In other words, the central portion 35d of the pair of first side surfaces 35 in the Y direction means not only the central portion of the first side surfaces 35 in the Y direction, but also an area of ​​a predetermined size including the central portion of the first side surfaces 35 in the Y direction.

[0075] 6, one side surface 35a (on the X2 direction side) of the pair of first side surfaces 35 partially protrudes in the X2 direction. The other side surface 35b (on the X1 direction side) of the pair of first side surfaces 35 does not protrude in the X1 direction. That is, the side surface 35b is a flat surface extending along the Y direction.

[0076] In this embodiment, as shown in FIG. 6, the second positioning through hole 34b is provided on the X2 direction side of the fastening through hole 33a in the first protruding portion 33. In other words, the second positioning through hole 34b is formed in the first protruding portion 33 such that the center 34g of the second positioning through hole 34b is located on the X2 direction side of the center 33f of the fastening through hole 33a. In addition, the second positioning through hole 34b is provided on the Y1 direction side of the fastening through hole 33a in the first protruding portion 33. In other words, the second positioning through hole 34b is formed in the first protruding portion 33 such that the center 34g of the second positioning through hole 34b is located on the Y1 direction side of the center 33f of the fastening through hole 33a.

[0077] In this embodiment, as shown in FIG. 6, the first protrusion 33 and the second protrusion 34 are configured to intersect with the pair of bus bars 40. Consider an imaginary straight line 90 connecting the center 33f of the fastening through hole 33a and the center 34f of the first positioning through hole 34a, and an imaginary straight line 91 connecting the center 40c of the bus bar 40a and the center 40d of the bus bar 40b in the X direction. In this embodiment, the first protrusion 33, the second protrusion 34, and the pair of bus bars 40 are provided on the housing 32 so that the imaginary straight line 90 and the imaginary straight line 91 are substantially orthogonal to each other. Note that the imaginary straight line 90 and the imaginary straight line 91 being substantially orthogonal to each other means that the angle at which the imaginary straight line 90 and the imaginary straight line 91 intersect with each other is not limited to 90 degrees, and may include an angle that is greater (or smaller) than 90 degrees by a predetermined angle.

[0078] Here, a method of attaching the current sensor 30 to the base portion 22 (see FIG. 2) will be described with reference to FIG. 4. When attaching the current sensor 30 to the base portion 22, first, the second protrusion 62a is inserted into the second positioning through hole 34b. Then, the first protrusion 61a is inserted into the first positioning through hole 34a. This determines the position of the current sensor 30 relative to the base portion 22. Since the first positioning through hole 34a has an elongated hole shape, the position of the current sensor 30 in the X direction can be adjusted. Then, the fastening member 70 is inserted into the fastening through hole 33a and fastened. This fixes the current sensor 30 to the base portion 22.

[0079] [Effects of this embodiment] In this embodiment, the following effects can be obtained.

[0080] In this embodiment, as described above, the power conversion device 100 includes the boost converter unit 20 that boosts the DC power input from the DC power source 200, the inverter unit 10 that converts the DC power boosted by the boost converter unit 20 into AC power and supplies the AC power to the load 210, the DC-DC converter unit 21 that transforms the DC power input from the DC power source 200, the current sensor 30 that measures the current flowing through the boost converter unit 20, and the inverter unit 10. The current sensor 30 includes a sensor unit 31 that measures a current flowing through the boost converter unit 20, and a housing 32 having a single fastening through hole 33a through which a fastening member 70 is inserted when fastened to the base unit 22, and positioning through holes (first positioning through hole 34a and second positioning through hole 34b) for positioning relative to the base unit 22.

[0081] As a result, unlike a configuration in which the housing 32 is fastened by a plurality of fastening members 70, the housing 32 can be fixed to the base portion 22 by fastening a single fastening member 70, and an increase in the number of parts can be suppressed. In addition, since the housing 32 has a positioning through hole, when the housing 32 is fixed to the base portion 22, the positioning of the housing 32 can be easily performed by the positioning through hole. In addition, since the housing 32 can be fixed to the base portion 22 by fastening a single fastening member 70, the workload during assembly can be reduced compared to a configuration in which the housing 32 is fixed to the base portion 22 by a plurality of fastening members 70. As a result, the number of work steps can be reduced while suppressing an increase in the number of parts.

[0082] In this embodiment, as described above, the housing 32 includes the first protruding portion 33 protruding from one side surface 35a of a pair of opposing first side surfaces 35 and the second protruding portion 34 protruding from the other side surface 35b of the pair of first side surfaces 35, the fastening through hole 33a is provided in the first protruding portion 33, and the positioning through hole includes the first positioning through hole 34a provided in the second protruding portion 34. As a result, the first protruding portion 33 and the second protruding portion 34 protrude from different side surfaces 35a and 35b of the pair of first side surfaces 35, so that the fastening through hole 33a and the first positioning through hole 34a can be provided on different side surfaces 35a and 35b of the pair of first side surfaces 35. Therefore, the fastening through hole 33a and the first positioning through hole 34a can be arranged at positions farther apart than in a configuration in which the fastening through hole 33a and the first positioning through hole 34a are provided on the same side of the pair of first side surfaces 35. In addition, since the fastening member 70 inserted through the fastening through hole 33a also contributes to the positioning of the housing 32, the housing 32 can be positioned at two positions farther apart than in a configuration in which the fastening through hole 33a and the first positioning through hole 34a are provided on the same side of the pair of first side surfaces 35. Therefore, when the housing 32 is fixed by the fastening member 70, the housing 32 can be positioned with high accuracy. As a result, the positioning accuracy of the current sensor 30 can be improved when the current sensor 30 is fixed to the base part 22, compared to a configuration in which the fastening through hole 33a and the first positioning through hole 34a are provided on the same side of the pair of first side surfaces 35.

[0083] In this embodiment, as described above, the positioning through holes are provided in the first protruding portion 33, and further include the second positioning through hole 34b for positioning with respect to the base portion 22. This makes it possible to position the current sensor 30 using the two positioning through holes, the first positioning through hole 34a and the second positioning through hole 34b, so that the current sensor 30 can be positioned more easily and reliably than in a configuration having only one positioning through hole.

[0084] In this embodiment, as described above, the first positioning through hole 34a has an elongated hole shape extending in the X direction in which the first protrusion 33 and the second protrusion 34 are aligned, and the second positioning through hole 34b has a perfect circle shape. As a result, since the first positioning through hole 34a has an elongated hole shape extending in the X direction, it is possible to absorb manufacturing errors in the X direction of the housing 32 and the base part 22. Furthermore, since the first positioning through hole 34a has an elongated hole shape extending in the X direction, it is possible to position the housing 32 relative to the base part 22 in the Y direction intersecting the X direction while absorbing manufacturing errors in the X direction of the housing 32 and the base part 22. As a result, by positioning the housing 32 based on the second positioning through hole 34b having a perfect circle shape, it is possible to easily position the current sensor 30 even if there is a manufacturing error in the X direction of the housing 32 and the base part 22.

[0085] In this embodiment, as described above, the housing 32 includes a first end surface 32a on the base portion 22 side and a second end surface 32b opposite to the first end surface 32a, and the first protrusion 33 and the second protrusion 34 are provided on the first end surface 32a side of the pair of first side surfaces 35 so as to form a step 37 between the first end surface 32a and the second end surface 32b. Here, for example, when the current sensor 30 is fixed to the base portion 22 in a non-contact state, the housing 32 is fixed to the first boss 60 formed in the base portion 22 and provided with an engagement hole 60a with which the fastening member 70 engages. In addition, when positioning the housing 32, a second boss 61 provided with a first protrusion 61a inserted into the first positioning through hole 34a is formed in the base portion 22, and the housing 32 is positioned. When the height of the first boss 60 provided with the engagement hole 60a (length L1 of the first columnar portion 60b) and the height of the second boss 61 provided with the first protrusion 61a inserted into the first positioning through hole 34a (length L3 of the second columnar portion 61b) increase, the material of the base portion 22 increases. Therefore, by configuring as described above, the fastening through hole 33a and the positioning through hole can be provided at a position closer to the base portion 22 compared to a configuration in which the fastening through hole 33a and the positioning through hole are arranged on the same plane as the second end face 32b. Therefore, it is possible to reduce the height of the first boss 60 (length L1 of the first columnar portion 60b) in which the engagement hole 60a of the fastening member 70 fastened to the base portion 22 is provided, the height of the second boss 61 (length L3 of the second columnar portion 61b) in which the first protrusion 61a for inserting into the positioning through hole and positioning the current sensor 30 is provided, and the height of the third boss 62 (length L5 of the third columnar portion 62b) in which the second protrusion 62a for inserting into the positioning through hole and positioning the current sensor 30 is provided. As a result, it is possible to reduce the material of the base portion 22 compared to a configuration in which the fastening through hole 33a and the positioning through hole are arranged on the same plane as the second end face 32b.

[0086] In this embodiment, as described above, the end surface 33b of the first protrusion 33 on the base 22 side and the end surface 34c of the second protrusion 34 on the base 22 side are provided on the second end surface 32b side from the position of the center 35c between the first end surface 32a and the second end surface 32b. Here, when the first protrusion 33 and the second protrusion 34 are disposed in a position close to the first end surface 32a, the first protrusion 33 and the second protrusion 34 are disposed in a position farther away from the worker when the current sensor 30 is attached to the base 22. Therefore, compared to the case where the first protrusion 33 and the second protrusion 34 are disposed in a position close to the worker, when the first positioning protrusion 61a is inserted into the first positioning through hole 34a formed in the second protrusion 34, it becomes difficult to visually confirm the position of the first positioning through hole 34a. In addition, when the fastening member 70 is inserted through the fastening through hole 33a formed in the first protrusion 33, the position of the fastening through hole 33a becomes difficult to visually confirm. In contrast, by configuring as described above, the positions of the first protrusion 33 and the second protrusion 34 can be brought closer to the second end face 32b while forming a step 37 between the first protrusion 33 and the second protrusion 34 and the second end face 32b. Therefore, the fastening through hole 33a and the first positioning through hole 34a can be provided at a position close to the second end face 32b. Therefore, when positioning the current sensor 30, the position of the first positioning through hole 34a becomes easier to visually confirm. In addition, when fixing the current sensor 30 to the base 22, the position of the fastening through hole 33a becomes easier to visually confirm. As a result, the positioning work and the fastening work of the current sensor 30 can be easily performed while reducing the material of the base 22.

[0087] In this embodiment, as described above, the first protrusion 33 has the fastening through hole 33a formed at a position aligned with the central portion 35d of the pair of first side surfaces 35 in the Y direction intersecting with the X direction in the X direction in which the first protrusion 33 and the second protrusion 34 are aligned, and the second protrusion 34 has the first positioning through hole 34a formed at a position aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction. This allows a fastening force to be applied to the central portion of the housing 32 in the Y direction when the current sensor 30 is fixed to the base 22. As a result, it is possible to apply a fastening force evenly to the ends of the housing 32 on one side and the other side in the Y direction, so that the current sensor 30 can be stably fixed to the base 22 compared to a configuration in which the fastening through hole 33a is arranged on either one end side in the Y direction.

[0088] In this embodiment, as described above, the current sensor 30 further includes a pair of bus bars 40, one of which is connected to the boost converter unit 20, and the pair of bus bars 40 are provided on a pair of second side faces 36 different from the pair of first side faces 35. As a result, since the pair of bus bars 40 are provided on a pair of second side faces 36 different from the pair of first side faces 35, it is possible to prevent the pair of bus bars 40 from interfering with the work when positioning and fastening the current sensor 30, compared to a configuration in which the pair of bus bars 40 are provided on the pair of first side faces 35. As a result, it is possible to improve the workability of positioning and fastening the current sensor 30.

[0089] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

[0090] For example, in the above embodiment, an example of a configuration in which the housing 32 includes the first protruding portion 33 and the second protruding portion 34, the fastening through hole 33a is provided in the first protruding portion 33, and the first positioning through hole 34a is provided in the second protruding portion 34 has been described, but the present invention is not limited to this. For example, the housing does not need to include the first protruding portion 33 and the second protruding portion 34. In this case, the fastening through hole and the first positioning through hole may be provided at positions of the housing 32 that face each other.

[0091] In the above embodiment, an example of a configuration in which the housing 32 includes the first protruding portion 33 and the second protruding portion 34, the fastening through hole 33a is provided in the first protruding portion 33, and the first positioning through hole 34a is provided in the second protruding portion 34 has been described, but the present invention is not limited to this. For example, the fastening through hole and the first positioning through hole do not have to be provided in positions facing each other. The fastening through hole and the first positioning through hole may be provided in the same side of the pair of first side surfaces 35, or one may be provided in either side of the first side surface 35 and the other may be provided in either side of the second side surface 36.

[0092] In the above embodiment, the positioning through hole includes the second positioning through hole 34b, but the present invention is not limited to this. For example, the positioning through hole does not have to include the second positioning through hole 34b. However, if the positioning through hole does not include the second positioning through hole 34b, the workability of positioning the current sensor 30 decreases. Therefore, it is preferable that the positioning through hole includes the second positioning through hole 34b.

[0093] In the above embodiment, the positioning through hole includes two positioning through holes, the first positioning through hole 34a and the second positioning through hole 34b, but the present invention is not limited to this. For example, the positioning through hole may include three or more positioning through holes.

[0094] In the above embodiment, the first positioning through hole 34a has an elongated hole shape extending in the X direction, and the second positioning through hole 34b has a perfect circle shape, but the present invention is not limited to this. For example, the first positioning through hole may have a perfect circle shape, and the second positioning through hole may have an elongated hole shape extending in the X direction.

[0095] In the above embodiment, the first positioning through hole 34a has an elongated hole shape, and the second positioning through hole 34b has a perfect circle shape. However, the present invention is not limited to this. For example, both the first positioning through hole and the second positioning through hole may have a perfect circle shape. However, if both the first positioning through hole and the second positioning through hole have a perfect circle shape, it becomes difficult for the housing 32 and the base part 22 to absorb manufacturing errors in the X direction. Therefore, it is preferable that either the first positioning through hole or the second positioning through hole is configured to have an elongated hole shape.

[0096] In the above embodiment, the first protrusion 33 and the second protrusion 34 are disposed on the first end face 32a side so as to form a step 37 between them and the second end face 32b, but the present invention is not limited to this. For example, the first protrusion 33 and the second protrusion 34 may be provided on the pair of first side faces 35 so as not to form a step 37 between them and the second end face 32b. However, when the first protrusion 33 and the second protrusion 34 are provided on the pair of first side faces 35 so as not to form a step 37 between them and the second end face 32b, the heights of the first boss 60, the second boss 61, and the third boss 62 need to be increased, and the material required to form the base portion 22 increases. Therefore, it is preferable that the first protrusion 33 and the second protrusion 34 are disposed on the first end face 32a side so as to form a step 37 between them and the second end face 32b.

[0097] In the above embodiment, an example of a configuration in which the end face 33b of the first protruding portion 33 on the base portion 22 side and the end face 34c of the second protruding portion 34 on the base portion 22 side are provided closer to the second end face 32b than the position of the center 35c of the first end face 32a and the second end face 32b is shown, but the present invention is not limited to this. For example, the end face 33b of the first protruding portion 33 on the base portion 22 side and the end face 34c of the second protruding portion 34 on the base portion 22 side may be provided closer to the first end face 32a than the position of the center 35c of the first end face 32a and the second end face 32b. However, when the end face 33b of the first protrusion 33 on the base portion 22 side and the end face 34c of the second protrusion 34 on the base portion 22 side are provided closer to the first end face 32a than the center 35c of the first end face 32a and the second end face 32b, the workability of the positioning and fastening work of the current sensor 30 decreases. Therefore, it is preferable that the end face 33b of the first protrusion 33 on the base portion 22 side and the end face 34c of the second protrusion 34 on the base portion 22 side are provided closer to the second end face 32b than the center 35c of the first end face 32a and the second end face 32b.

[0098] In the above embodiment, the fastening through hole 33a and the first positioning through hole 34a are formed at a position where the first protrusion 33 and the second protrusion 34 are aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction, but the present invention is not limited to this. For example, in the present invention, the fastening through hole 33a and the first positioning through hole 34a may be formed so that the first protrusion 33 and the second protrusion 34 are positioned at a position other than the position where they are aligned with the central portion of the pair of first side surfaces 35 in the X direction. However, when the fastening through hole 33a and the first positioning through hole 34a are formed so that the first protrusion 33 and the second protrusion 34 are positioned at a position other than the position where they are aligned with the central portion 35d of the pair of first side surfaces 35 in the X direction, it becomes difficult for the fastening member 70 to apply a fastening force evenly to the ends on one side and the other side in the Y direction, and it becomes difficult to stably fix the current sensor 30 to the base portion 22. Therefore, it is preferable that the first protrusion 33 and the second protrusion 34 are configured so that the fastening through hole 33a and the first positioning through hole 34a are formed so as to be positioned in line with the central portion 35d of the pair of first side surfaces 35 in the X direction.

[0099] In the above embodiment, an example of a configuration in which the pair of bus bars 40 are provided on the pair of second side faces 36 has been described, but the present invention is not limited to this. For example, in the present invention, the pair of bus bars may be provided on the pair of first side faces 35. However, in a configuration in which the pair of bus bars are provided on the pair of first side faces 35, the pair of bus bars interfere with the work when positioning and fastening the current sensor 30. Therefore, it is preferable that the pair of bus bars 40 are provided on the pair of second side faces 36.

[0100] In the above embodiment, an example of a configuration in which the current sensor 30 includes a pair of bus bars 40, one of which is connected to the boost converter unit 20, has been described, but the present invention is not limited to this. For example, the current sensor does not need to include a pair of bus bars 40. In this case, the current sensor only needs to include wiring that is connected to the boost converter unit 20 and is capable of passing a current.

[0101] In the above embodiment, the fastening through hole 33a is larger than the first positioning through hole 34a and the second positioning through hole 34b, but the present invention is not limited to this. For example, the fastening through hole may be equal in size to the first positioning through hole 34a and the second positioning through hole 34b, or may be smaller than the first positioning through hole 34a and the second positioning through hole 34b. As long as the fastening member 70 can be inserted through the fastening through hole 33a, the opening size of the fastening through hole 33a is not important.

[0102] In the above embodiment, the first positioning through hole 34a is larger than the second positioning through hole 34b, but the present invention is not limited to this. For example, the first positioning through hole 34a may be equal in size to the second positioning through hole 34b, or may be smaller than the second positioning through hole 34b. As long as the current sensor 30 can be positioned, the opening sizes of the first positioning through hole 34a and the second positioning through hole 34b are not important.

[0103] In the above embodiment, the power conversion device 100 is disposed between the inverter unit 10 and the DC-DC converter unit 21, and includes the cooling unit 50 for cooling the inverter unit 10 and the DC-DC converter unit 21. However, the present invention is not limited to this. For example, the power conversion device does not need to include the cooling unit 50. However, if the power conversion device does not include the cooling unit 50, the inverter unit 10 and the DC-DC converter unit 21 are not cooled, and the power conversion efficiency decreases. Therefore, it is preferable that the power conversion device 100 includes the cooling unit 50.

[0104] In the above embodiment, the DC-DC converter unit 21 is provided on the Z1 direction side, and the inverter unit 10 is provided on the Z2 direction side, but the present invention is not limited to this. For example, the DC-DC converter unit 21 may be provided on the Z2 direction side, and the inverter unit 10 may be provided on the Z1 direction side. [Explanation of symbols]

[0105] 10 Inverter section 20 Boost converter section 21 DC-DC converter section 22 Base 30 Current Sensor 31 Sensor section 32 Case 32a: First end surface (the end surface of the housing on the base side) 32b: second end face (an end face of the housing opposite to the first end face) 33 First protrusion 33a Through hole for fastening 33b end face (the end face of the first protruding portion on the base portion side) 34 Second protrusion 34a First positioning through hole 34b Second positioning through hole 34c end face (end face of the second protruding portion on the base portion side) 35 Pair of first sides 35a Side (one of the pair of first sides) 35b Side (the other side of the pair of first sides) 35c Center (center between the first end face and the second end face) 35d central portion (a central portion of a pair of first side surfaces in a second direction intersecting with a first direction in which the first protrusion and the second protrusion are aligned) 36 Pair of Second Sides 37 Step (step between the first protruding portion and the second protruding portion and the second end surface) 40 Pair of busbars 70 Fastening members 100 Power conversion device 200 DC power supply 210 Load

Claims

1. a boost converter unit that boosts the DC power input from the DC power supply; an inverter unit that converts the DC power boosted by the boost converter unit into AC power and supplies the AC power to a load; a DC / DC converter unit that transforms the DC power input from the DC power source; a current sensor that measures a current flowing in the boost converter; a flat base portion on which the boost converter portion, the inverter portion, the DC-DC converter portion, and the current sensor are arranged, The current sensor is a power conversion device that includes a sensor unit that measures the current flowing through the boost converter unit, and a housing having a single fastening through hole through which a fastening member is inserted when fastened to the base unit, and a positioning through hole for positioning relative to the base unit.

2. the housing includes a first protruding portion protruding from one side surface of a pair of first side surfaces facing each other, and a second protruding portion protruding from the other side surface of the pair of first side surfaces, The fastening through hole is provided in the first protrusion, The power conversion device according to claim 1 , wherein the positioning through holes include a first positioning through hole provided in the second protrusion.

3. The power conversion device according to claim 2 , wherein the positioning through hole is provided in the first protruding portion and further includes a second positioning through hole for positioning with respect to the base portion.

4. the first positioning through hole has an elongated hole shape extending in a first direction in which the first protruding portion and the second protruding portion are aligned, The power conversion device according to claim 3 , wherein the second positioning through hole has a perfect circular shape.

5. the housing includes a first end surface on the base portion side and a second end surface opposite to the first end surface, The power conversion device according to claim 2 , wherein the first protrusion and the second protrusion are provided on the pair of first side surfaces on the first end surface side so as to form a step between the pair of first side surfaces and the second end surface.

6. 6. The power conversion device according to claim 5, wherein an end face of the first protrusion facing the base portion and an end face of the second protrusion facing the base portion are provided closer to the second end face than a center position between the first end face and the second end face.

7. the first protruding portion has the fastening through hole formed at a position aligned with a central portion of the pair of first side surfaces in a second direction intersecting with the first direction in a first direction in which the first protruding portion and the second protruding portion are aligned, The power conversion device according to claim 2 , wherein the first positioning through hole is formed so that the second protrusion is positioned at the central portion of the pair of first side surfaces in the first direction.

8. The current sensor further includes a pair of bus bars, one of which is connected to the boost converter unit, The power conversion device according to claim 1 , wherein the pair of bus bars are provided on a pair of second side surfaces different from the pair of first side surfaces.

Images